US3693704A - Air conditioning system - Google Patents

Air conditioning system Download PDF

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Publication number
US3693704A
US3693704A US71550A US3693704DA US3693704A US 3693704 A US3693704 A US 3693704A US 71550 A US71550 A US 71550A US 3693704D A US3693704D A US 3693704DA US 3693704 A US3693704 A US 3693704A
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Prior art keywords
liquid
coils
conduit
heated
chilled
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US71550A
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English (en)
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Alwin B Newton
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York International Corp
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Borg Warner Corp
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Assigned to YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAND AVENUE, YORK, PA 17403, A CORP. OF DE reassignment YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAND AVENUE, YORK, PA 17403, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BORG-WARNER CORPORATION
Assigned to CANADIAN IMPERIAL BANK OF COMMERCE reassignment CANADIAN IMPERIAL BANK OF COMMERCE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YORK INTERNATIONAL CORPORATION
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/08—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with separate supply and return lines for hot and cold heat-exchange fluids i.e. so-called "4-conduit" system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers

Definitions

  • the system provides local Fleld of Search I9, 20, 2I, 22, control at each unit, for both heating and cooling at References Cited all times when the heated water and chilled water circuits are active, as each circuit in the unit includes a UNITED STATES PATENTS circulating pump and coil, the pumps being under thermostatic control responsive to room temperature 1,827,099 10/1931 Otis 165/21 requirement 3,191,668 6/1965 Lorenz ..l65/22 3,378,062 4/1968 Rinquist et al ..165/22 7 Claims, 5 Drawing Figures I I I l AIR CONDITIONING SYSTEM This invention relates generally to air conditioning systems, and more particularly to a piping or water dis tribution system for a multi-room air conditioning installation.
  • each room air conditioning unit is suppliedwith heated and chilled water through separate lines and is returned to the heater and chiller through separate lines, respectively.
  • vIn a three-pipe" system -each room air conditioning unit is supplied with heated and chilled water through separate lines, but the returning water is mixed together in a common line for return to the water chiller and heater.
  • the two-pipe system comprises one supply line and one return line connected to each room unit.
  • This system is thus limited to circulating .hot and cold water to all units in the system at any given period so that, normally, hot water is circulated when most of the rooms require heating, and cold water when most of the, rooms require cooling. When intermediate conditions exist, accurate control is impossible.
  • the threepipe system has achieved significant commercial success over the four-pipe system because of its lower installation cbst, attributed to its omission of the extra line for returning the water to the water chiller or heater.
  • the three-pipe system has been beset with problems, principally in the area of operating economy. The cost of chilling and heating water at a temperature which is approximately intermediate the desired operating temperature of the chilled water and hot water is obviously much higher than colling the returning water from the units receiving chilled water and heating the water returning from the units receiving hot water in a four-pipe system.
  • the savings in piping cost by omitting costs one pipe are so substantial that the three-pipe system has been almost universally accepted for use in multi-room buildings.
  • the cost of piping for the water distribution system in the typical multi-room building may run as high as 50 percent of the cost of the entire installation including the heater, the chiller, the room units, and controls.
  • most efforts have been directed toward decreasing the cost and improving the efficiency of the water chiller and other mechanical components, but it will be apparent that savings achieved in the piping and water distribution system represent a greater percentage of the total job cost than economies in the aforesaid areas.
  • the present invention can be characterized generally as an improved air conditioning system for a multiroom building and which may be termed a twin-pipe system, as each room is provided with a heat exchange unit having separate heating and cooling coils, the heating coils of the heat exchange units being connected to a single heated water supply pipe or loop and the colling coils of the heat exchange units being connected to a single chilled water supply pipe or loop.
  • the system provides local thermostatic control at each room unit, for both heating and cooling, at all times when the heated water and chilled water loops are both active.
  • Each unit hastwo pumps, one pump for circulating chilled water through the cooling coil and the other pump circulating heated water through the heating coil, operation of the pumps being individually and selectively controlled by a thermostat in the unit location.
  • the present invention is also directed. to providing improved humidity control arrangements.
  • One arrangement for highly humid areas being provided by a humidistat in each room and which is effective to energize the chilled water pump when the humidity rises above some maximum value such as percent. Sufficient operation from the humidity control will force the room thermostat into the heating position, thus providing re-heat.
  • a second method of applying re-heat is disclosed in which the humidity'controller is effective to energize the heated water pump, ora valve, to provide heated water in the unit upon a humidity rise to maximum value (60 percent). The resulting action will either lower the humidity by direct application of heat or, in addition, forces the thermostat into its cooling position to also energize the chilled water pump and provide dehumidification and offset suplus heat.
  • Another object of the invention is to provide improved control systems for a multi-room air conditioning system of the twin-pipe type and in which each heat exchange room unit includes a pump controlling flow of chilled water through the,cooling coil and a pump controlling heated water flow in the heating coil.
  • Another object of the invention is to provide improved control systems for a multi-room air conditioning system of the twin-pipe" type and in which each unit is provided with a chilled water pump and a heated water pump with their operation thermostatically controlled.
  • Another object of the invention is to provide improved control systems for a multi-room air conditioning system of the twin-pipe type and in which the operation of a chilled water pump and heated water pump of each unit is supplied with and controlled by a thermostat and a humidistat for modifying thermostat operation.
  • FIG. 1 is a cross-sectional view of an air conditioning system embodying the present invention
  • FIG. 2 is a schematic illustration of a preferred temperature and humidity control arrangement
  • FIG. 3 is a schematic illustration of a modified temperature and humidity control arrangement.
  • FIG. 4 is a cross-sectional view of a modified inlet connection for one of the room air conditioning units.
  • FIG. 5 is a cross-sectional view of a modified outlet connection for one of the room air conditioning units.
  • a plurality of room air conditioning units and 11 are respectively located in rooms or zones A and B to be conditioned.
  • Theimprovements of the present invention are adapted for use with a multiplicity of two or more units in series, the units being either induction or fan coil types of air handling or room air conditioning units or in combination, such as the units 10 and l l.
  • the unit 10 is an induction type air conditioner, the construction and operation of which are well understood in the art.
  • Primary air from a suitable source is directed into a plenum chamber 12 and directed through a nozzle 13 into an induction chamber 14.
  • room air is induced to pass over a heat exchange coil 15, supplied with chilled water,
  • a heat exchange coil 16 supplied with heated water, and the heated or cooled air, 'as the case may be, passes through an opening 17 in the top of a cabinet 18 into the room.
  • the unit 1 l is a fan coil type air conditioner and having a fan 19 operated by a motor 20 for inducing room air to pass over a heat exchange coil 21, supplied with chilled water, and then over a heat exchange coil 22, supplied with heated water, the heated or cooled air exiting through a top opening in the cabinet 23.
  • Heated water is supplied to the heat exchange coils 16 and 22 by a closed circuit pipe or conduit system including a hot water supply and return conduit 24 constituting the major portion of the circuit.
  • Each room air conditioner has its chilled water coil connected by con ventional T-fittings to a supply riser 24a and a return riser 24b.
  • a water heater 25 and pump 26 are provided in series in. the conduit 24, the pump causing water to flow continuously through the heater 25 and riser 24a, the distribution loop 24a, and return riser 24b to pump 26.
  • Coils 16 and 22 may be supplied with hot water through lines 27 and 28. Water is returned to loop 24a through lines 29 and 30.
  • the inlet lines 27, 28, 34 and are provided with small circulating pumps 38 and 39, each pump being preferably of the type known as a March model MDX-35 (March Mfg. Co., Skokie, Ill. each pump in cluding a completely enclosed, magnetic rotor 40 driven by motor 41 through an external rotating magriet 42. In the de-energized condition of each pump, it prevents flow of water from the associated conduits 24 or 31 to the heat exchange coil connected thereto.
  • March model MDX-35 March Mfg. Co., Skokie, Ill. each pump in cluding a completely enclosed, magnetic rotor 40 driven by motor 41 through an external rotating magriet 42. In the de-energized condition of each pump, it prevents flow of water from the associated conduits 24 or 31 to the heat exchange coil connected thereto.
  • Each air conditioner unit has the energization of the motors 40 of its pumps 38 controlled by the temperature of the air in the room to be conditioned as sensed by the temperature-responsive bulb 43 of a low differential heating-cooling thermostatic switch T.
  • the bulb 43 senses a room temperature below the desired temperature level thereby calling for heating by the air conditioner unit
  • motor 41 of the pump 38 of the unit is energized to provide for the flow of heated water through the heat exchange heating coil 16; and, if bulb 43 senses a temperature above the desired temperature level, thereby calling for cooling by the air conditioner unit, motor 41 of the pump 39 of the unit is energized to provide for the flow of chilled water through the cooling coil 15.
  • the pump motor control for each room unit may be constructed in the manner shown in FIGS. 2 and 3 in which the thermostatic control is a SPDT switch 44, with an intermediate neutral or off position, activated by the temperature-responsive bulb 43.
  • Switch 44 has a contact 45 movable between a cooling identified contact (corresponding) to a corresponding for cooling and closed at approximately 74 F.) and a heating identified contact (corresponding to a demand for heating and closed at approximately 73 F.). It will be apparent that the system provides local control at each unit, for both heating and cooling, at all times when the heated water and chilled water circuits are both active.
  • the heating coil is located downstream from the cooling coil, and re-heat may be provided in the individual units by the addition of a humidity controller.
  • Re-heat may be provided in either of two ways depending on geographical preference or designers choice. For highly humid areas, it may bepreferable to connect a humidistat to actuate a switch H, shown in FIGS. 1 (unit A) and 2 to the thermostatic switch T so that, when the humidity rises above some maximum value such as 60 percent, the humidity-actuated switch will close to provide an electrical circuit via conductors 46 and 47 to energize the motor of the chilled water circulating pump 39 of the air conditioner unit.
  • a humidistat to actuate a switch H, shown in FIGS. 1 (unit A) and 2 to the thermostatic switch T so that, when the humidity rises above some maximum value such as 60 percent, the humidity-actuated switch will close to provide an electrical circuit via conductors 46 and 47 to energize the motor of the chilled water circulating pump 39 of the air conditioner unit.
  • the room temperature falls to a predetermined value causing the temperature-responsive bulb 43 to operate and move the contact 45 of switch 44 to the heating" contact to provide an electrical circuit energizing the motor of the heated water circulating pump 38 to provide re-heat to lower the room humidity so that the humidistat will operate to open its switch to interrupt the motor-energizing electric circuit provided by conductor 46, switch H and conductor 47.
  • a second method of applying re-heat is shown in FIGS.
  • the scoop fittings are the special type identified as Mono- Flow T-fittings (manufactured by Bell and Gossett Co.).
  • the inlet fitting 50 (FIG. 4) and the outlet fitting 51 (FIG. 5) are constructed so that they divert a portion of the water flowing through lines 24 and 31 to the heat exchange coils by means of cone shaped baffles 52, 53, respectively.
  • the outlet fittings 51 (FIG. 5) are arranged so that baffle 53 restricts the flow of water through line 31, thereby increasing its velocity and inl. a liquid to air heat exchanger having a chilled liquid coil and a heated liquid coil, and
  • a heater adapted to heat a liquid heat exchange medi- C.
  • a chiller adapted to cool a liquid heat exchange medium;
  • D a first closed circuit conduit system interconnecting ducing flow through the outlet line 29 (or 36) and the 15 water coils.
  • the inlet fitting (FIG. 4) is arranged so that the baffle 52 scoops a portion of the water passing through lines 24 and 31, thereby facilitating flow into the inlet line 27 (or 34).
  • This type of construction is further discussed U. S. Pat. No. 3,384,155 issued to A. B. Newton on May 21, 1968. It is understood that the Mono-flow fittings may also be used in the fan-coil unit 1 1.
  • twin-pipe system of the present invention provides operating results equal to a four-pipe system and at substantially lower installation costs and reduction in space required for the pipes.
  • Another improvement resides in providing each room air conditioning unit with its own circulating pumps, thus completely eliminating the conventional control valves and thereby improving reliability, and permitting the main circulating pumps for the chilled water and heated water loops to be reduced in size since these pumps handle only the loop pressure and are not required to force water through the coils within the room units.
  • Another advantageous feature is that a fan coil room unit of the twin-pipe" system can be factory assembled complete with its won circulating pumps so that excessive field labor is reduced with the assurance that factory quality control is provided.
  • twin-pipe system eliminates all interchange of water between the chilled water and heated water loops thereby avoiding all hydraulic problems that could possibly be created by inter-connections; also avoiding storing of off cycle heated or chilled water; and eliminates any possibility of operating difficulties of the chiller which can sometimes be caused by inadvertent or accidental return from the heated water loop.
  • Another advantageous feature of the invention is the improved control arrangements for the heated water and chilled water pumps of each room unit provided by the heating-cooling thermostat control of the pumps and the humidity control of the pumps modifying the operation of the thermostat control.
  • a multi-room air conditioning system comprising: A. a plurality of room air conditioning units located in a plurality of zones subject to various thermal loads, each said conditioning unit including:
  • said system including:
  • G means for controlling the flow of heated liquid from said second inlet conduit to said heated liquid coils; one of said controlling means including pumps associated with the inlet conduits of one of said conduit systems and individually operable to control the flow of liquid from the main conduit of said one conduit system to the coils connected thereto.
  • both of said controlling means including pumps connected to said inlet conduits and individually operable to control the flow of heated and chilled liquid from the main conduits to the heated and chilled liquid coils of said heat exchangers.
  • a system as defined in claim 1 including:
  • a system as defined in claim 2 including:
  • said temperature control means includes:
  • a switch controlled by said thermostat and operable thereby to alternately establish said circuits to energize either said heated liquid pump or said chilled liquid pump.
  • a system as defined in claim 2 including;
  • first and second electric circuits for selectively energizing said heated liquid and chilled liquid pumps of the air conditioning unit in the zone and including:
  • a switch controlled by and responsive to said thermostat said switch having a first position establishing said first circuit for energizing said heated liquid pump, a second position establishing said second circuit for energizing said chilled liquid pump, and a third position in which said first and second circuits are open;
  • B. humidity controlling means including:
  • said temperature control means includes: A. a thermostat in at least one zone and responsive to the temperature of said zone; and B. electric circuits for selectively energizing said heated liquid and chilled liquid pumps of the air conditioning unit in the zone and including:
  • thermocontrol means including:
  • a thermostat in each zone and responsive to the temperature of the zone; and b. first and second electric circuits for selectively energizing said heated liquid and chilled liquid pumps of the air conditioning unit in the zone and including: v c. a switch controlled by and responsive to said thermostat, said switch having a first position establishing said first circuit for energizing said heated liquid pump, a second position establishing said second circuit for energizing said chilled liquid pump, and a third position in which said first and second circuits are open;
  • B. humidity controlling means including:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Air Conditioning Control Device (AREA)
US71550A 1970-09-11 1970-09-11 Air conditioning system Expired - Lifetime US3693704A (en)

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US7155070A 1970-09-11 1970-09-11

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US (1) US3693704A (enrdf_load_stackoverflow)
JP (1) JPS5635715Y2 (enrdf_load_stackoverflow)
AU (1) AU459169B2 (enrdf_load_stackoverflow)
CA (1) CA937403A (enrdf_load_stackoverflow)
DE (1) DE2145437A1 (enrdf_load_stackoverflow)
FR (1) FR2106460B1 (enrdf_load_stackoverflow)
GB (1) GB1367611A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123147A (en) * 1996-07-18 2000-09-26 Pittman; Jerry R. Humidity control apparatus for residential air conditioning system
US20040112584A1 (en) * 2002-12-17 2004-06-17 Kuo-Liang Weng controlling method for the discharge of coolant medium in the heat exchange wind box
US20050023362A1 (en) * 2003-08-01 2005-02-03 Honeywell International Inc. Method and apparatus for controlling humidity with a heater unit and a cooler unit
US20080053115A1 (en) * 2006-09-01 2008-03-06 Flow Design, Inc. Electronically Based Control Valve with Feedback to a Building Management System (BMS)
US20100012290A1 (en) * 2008-07-03 2010-01-21 Weston Jeffrey A Thermal gradient fluid header for multiple heating and cooling systems
US20110100497A1 (en) * 2008-06-07 2011-05-05 Uponor Innovation Ab Pipe arrangement for temperature control of buildings
US20120181009A1 (en) * 2007-05-01 2012-07-19 Blecker Joseph G Automatic Switching Two Pipe Hydronic System
US20120193066A1 (en) * 2011-01-31 2012-08-02 Peter Quentin Lowther Fan coil air conditioning system, a fan coil unit, and a method of controlling a fan coil air conditioning syst
US20120204981A1 (en) * 2011-02-10 2012-08-16 Coerdt Martin Drinking and domestic water system
US20130199772A1 (en) * 2012-02-02 2013-08-08 Semco Llc Chilled beam pump module, system, and method
US20180283706A1 (en) * 2017-03-29 2018-10-04 Dynamic Technology Limited Company Air conditioning system and air conditioning control method
US10408472B1 (en) * 2010-04-20 2019-09-10 Climacool Corp. Modular chiller unit with dedicated cooling and heating fluid circuits and system comprising a plurality of such units
US10900675B2 (en) 2012-12-03 2021-01-26 Waterfurnace International, Inc. Method of operating a heating and cooling system
US11747030B2 (en) 2021-03-12 2023-09-05 Semco Llc Multi-zone chilled beam system and method with pump module
US11815306B2 (en) * 2019-06-17 2023-11-14 Thermocan Dynamics Inc. Dynamic temperature regulating device
US11933504B2 (en) 2021-06-25 2024-03-19 Midea Group Co., Ltd. Makeup air packaged terminal air conditioning unit
US12044421B2 (en) 2016-06-08 2024-07-23 Semco Llc Air conditioning with recovery wheel, dehumidification wheel, cooling coil, and secondary direct-expansion circuit

Families Citing this family (4)

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NO143038C (no) * 1975-07-31 1980-12-03 Gartner & Co J Anordning for temperering av utenforliggende rom til en bygning og fremgangsmaate for denne temperering under anvendelse av nevnte anordning
US4413478A (en) * 1981-09-14 1983-11-08 Mcfarlan Alden I Air conditioning system and method
DE3225142A1 (de) * 1982-07-06 1984-01-12 Grundfos A/S, 8850 Bjerringbro Heizungsanlage
RU2307292C2 (ru) * 2005-11-01 2007-09-27 Федеральное государственное унитарное предприятие "Российский Федеральный ядерный центр-Всероссийский научно-исследовательский институт экспериментальной физики"-ФГУП "РФЯЦ-ВНИИЭФ" Способ подачи теплоносителя в калориферную установку

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US1827099A (en) * 1931-10-13 of moline
US3191668A (en) * 1960-12-29 1965-06-29 Trane Co Pump control system
US3378062A (en) * 1966-10-27 1968-04-16 Trane Co Four pipe heat pump apparatus

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US1827099A (en) * 1931-10-13 of moline
US3191668A (en) * 1960-12-29 1965-06-29 Trane Co Pump control system
US3378062A (en) * 1966-10-27 1968-04-16 Trane Co Four pipe heat pump apparatus

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123147A (en) * 1996-07-18 2000-09-26 Pittman; Jerry R. Humidity control apparatus for residential air conditioning system
US20040112584A1 (en) * 2002-12-17 2004-06-17 Kuo-Liang Weng controlling method for the discharge of coolant medium in the heat exchange wind box
US6945324B2 (en) * 2002-12-17 2005-09-20 Cohand Technology Co., Ltd. Controlling method for the discharge of coolant medium in the heat exchange wind box
US20050023362A1 (en) * 2003-08-01 2005-02-03 Honeywell International Inc. Method and apparatus for controlling humidity with a heater unit and a cooler unit
US7857233B2 (en) 2006-09-01 2010-12-28 Flow Design, Inc. Electronically based control valve with feedback to a building management system (BMS)
US20080053115A1 (en) * 2006-09-01 2008-03-06 Flow Design, Inc. Electronically Based Control Valve with Feedback to a Building Management System (BMS)
US20120181009A1 (en) * 2007-05-01 2012-07-19 Blecker Joseph G Automatic Switching Two Pipe Hydronic System
US8397799B2 (en) * 2007-05-01 2013-03-19 Joseph G. Blecker Automatic switching two pipe hydronic system
US20110100497A1 (en) * 2008-06-07 2011-05-05 Uponor Innovation Ab Pipe arrangement for temperature control of buildings
US20100012290A1 (en) * 2008-07-03 2010-01-21 Weston Jeffrey A Thermal gradient fluid header for multiple heating and cooling systems
US9068757B2 (en) * 2008-07-03 2015-06-30 Jeffrey A. Weston Thermal gradient fluid header for multiple heating and cooling systems
US10408472B1 (en) * 2010-04-20 2019-09-10 Climacool Corp. Modular chiller unit with dedicated cooling and heating fluid circuits and system comprising a plurality of such units
US20120193066A1 (en) * 2011-01-31 2012-08-02 Peter Quentin Lowther Fan coil air conditioning system, a fan coil unit, and a method of controlling a fan coil air conditioning syst
US20120204981A1 (en) * 2011-02-10 2012-08-16 Coerdt Martin Drinking and domestic water system
US20130199772A1 (en) * 2012-02-02 2013-08-08 Semco Llc Chilled beam pump module, system, and method
US10060638B2 (en) 2012-02-02 2018-08-28 Semco Llc Chilled beam pump module, system, and method
US9625222B2 (en) * 2012-02-02 2017-04-18 Semco Llc Chilled beam pump module, system, and method
US11092347B2 (en) 2012-02-02 2021-08-17 Semco Llc Chilled beam module, system, and method
US10900675B2 (en) 2012-12-03 2021-01-26 Waterfurnace International, Inc. Method of operating a heating and cooling system
US11713890B2 (en) 2012-12-03 2023-08-01 Waterfurnace International, Inc. Method of operating a heating and cooling system
US12117200B2 (en) 2012-12-03 2024-10-15 Waterfurnace International, Inc. Conduit module coupled with heating or cooling module
US12044421B2 (en) 2016-06-08 2024-07-23 Semco Llc Air conditioning with recovery wheel, dehumidification wheel, cooling coil, and secondary direct-expansion circuit
US20180283706A1 (en) * 2017-03-29 2018-10-04 Dynamic Technology Limited Company Air conditioning system and air conditioning control method
US11815306B2 (en) * 2019-06-17 2023-11-14 Thermocan Dynamics Inc. Dynamic temperature regulating device
US11747030B2 (en) 2021-03-12 2023-09-05 Semco Llc Multi-zone chilled beam system and method with pump module
US11933504B2 (en) 2021-06-25 2024-03-19 Midea Group Co., Ltd. Makeup air packaged terminal air conditioning unit

Also Published As

Publication number Publication date
JPS5635715Y2 (enrdf_load_stackoverflow) 1981-08-22
JPS55135220U (enrdf_load_stackoverflow) 1980-09-26
FR2106460A1 (enrdf_load_stackoverflow) 1972-05-05
DE2145437A1 (de) 1972-03-16
GB1367611A (en) 1974-09-18
AU3258071A (en) 1973-02-22
FR2106460B1 (enrdf_load_stackoverflow) 1973-06-29
CA937403A (en) 1973-11-27
AU459169B2 (en) 1975-03-20

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Owner name: YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAN

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